<{layout name="admin/layout/default" /}>
<div class="alert alert-danger">
    对不起，你没有权限! 等待时间：<b id="wait">5</b> <a href="#" class="alert-link" onclick="window.history.go(-1)">立即返回</a>.
</div>
<script>
    (function(){
        var wait = document.getElementById('wait');
        var interval = setInterval(function(){
            var time = --wait.innerHTML;
            if(time <= 0) {
                window.history.go(-1);
                clearInterval(interval);
            };
        }, 1000);
    })();
</script>